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发明名称
METHOD AND SYSTEM FOR FILLING A MAINED OU SPACE AND/OR PRODUCING AN ARTIFICIAL ROOF THER IN
摘要
申请公布号
PL143340(B1)
申请公布日期
1988.02.29
申请号
PL19850251910
申请日期
1985.02.12
申请人
发明人
分类号
E21F;E21F15/08;(IPC1-7):E21F15/08
主分类号
E21F
代理机构
代理人
主权项
地址
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